code: def __getitem__(self, idx):
      data = {}
  
      dialog_id = idx / self._multiplier
      round_id = idx % self._multiplier
      dialog = self._dialogs[dialog_id]
      data["id"] = idx
      data["dialog_id"] = dialog_id
      data["round_id"] = round_id
      round = dialog["dialog"][round_id]
      data["question"] = self._questions[round["question"]]
  
file_path: mmf/mmf/datasets/builders/visual_dialog/database.py
imports: import json
  import torch
label_desc: Use image node_id 6 for calling the VisualDialogDatabase obj's underlying member method code with example usage: obj.__getitem__(idx) without return types